/**
 * Shared helpers for reading Linux `/proc/<pid>/stat` process identity fields.
 *
 * The `comm` field (field 2, wrapped in parentheses) may itself contain spaces
 * and parentheses, so the only robust anchor is the *last* `)` in the stat
 * string. Field 22 (the process start time in clock ticks since boot) is the
 * 20th whitespace-separated token after that closing paren (index 19). Field 7
 * (`tty_nr`) is the 5th token after the closing paren (index 4).
 */
export interface LinuxProcStatIdentity {
    state?: string;
    startTime: string;
    ttyDevice: string;
}
export type LinuxProcPidProbeResult = ({
    kind: "live";
} & LinuxProcStatIdentity) | {
    kind: "absent";
} | {
    kind: "unverifiable";
    reason: "unsupported_platform" | "invalid_pid" | "permission_denied" | "read_error" | "malformed_stat";
};
/** Parse field 22 (start time) from a `/proc/<pid>/stat` record. */
export declare function parseLinuxProcStartTime(stat: string | null | undefined): string | null;
/** Parse field 7 (`tty_nr`) from a `/proc/<pid>/stat` record. */
export declare function parseLinuxProcTtyDevice(stat: string | null | undefined): string | null;
/** Parse field 3 (single-letter process state) from a `/proc/<pid>/stat` record. */
export declare function parseLinuxProcState(stat: string | null | undefined): string | null;
export declare function probeLinuxProcPidSync(pid: number): LinuxProcPidProbeResult;
export declare function probeLinuxProcPid(pid: number): Promise<LinuxProcPidProbeResult>;
/**
 * Read `/proc/<pid>/stat` synchronously and return the parsed start time.
 * Returns `null` when the probe is absent or unverifiable.
 */
export declare function readLinuxProcStartTimeSync(pid: number): string | null;
/**
 * Read `/proc/<pid>/stat` asynchronously and return the parsed start time.
 * Returns `null` when the probe is absent or unverifiable.
 */
export declare function readLinuxProcStartTime(pid: number): Promise<string | null>;